27 Time library [time]

27.6 Class template time_­point [time.point]

27.6.1 Constructors [time.point.cons]

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constexpr time_point();
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Effects: Initializes d_­ with duration​::​zero().
Such a time_­point object represents the epoch.
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constexpr explicit time_point(const duration& d);
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Effects: Initializes d_­ with d.
Such a time_­point object represents the epoch + d.
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template<class Duration2> constexpr time_point(const time_point<clock, Duration2>& t);
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Constraints: is_­convertible_­v<Duration2, duration> is true.
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Effects: Initializes d_­ with t.time_­since_­epoch().